1. Aharoni. A. in Magnetic Properties of Fine Particles. ed. by J. L. Dormann and D. Fiorani. North-Holland, Amsterdam pp. 3 (1992)
2. Baibich, M. N., J. M. Broto, A. Fert, F. Nguyen Van Dau, F. Petroff, P. Etienne, G. Creuzet, A. Friederich and J. Chazeles. Phys. Rev. Lett.. 61, 2472 (1988)
3. Bancroft, G. M.. Mössbauer Spectroscopy: an Introduction for Inorganic Chemists and Geochemists. Wiley, New York (1973)
4. Berkowitz, A. E., J. R. Mitchell, M. J. Carey, A. P. Young, S. Zhang, F. E. Spada, F. T. Parker, A. Hatten and G. Thomas. Phys. Rev. Lett.. 68, 3745 (1992)
5. Cheetham, A. K. and A. P. Wilkinson. Angew. Chem. Int. Ed. Engl.. 31, 1557 (1992)